Bicycle-gear.



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(No Model.)

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EUGENE M. DAVIS, OF DUNKIRK, NEIV YORK.

BICYCLE-GEAR.

SPECIFIUATION forming part of Letters Patent No. 697,073, dated April 8, 1902.

Application filed Tune 10, 1901. Serial No. 63.924. (No model.)

To all whom it may concern:

Be it known that I, EUGENE M. DAVIS, a citizen of the United States, residing at Dunkirk, in the county of Chautauqua and State of New York, have invented certain new and useful Improvements in Bicycle-Gear; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the letters of reference marked thereon, forming part of this specification.

My invention relates to improvements in bicycle-gear; and it consists in the mechanism hereinafter set forth and described, and illustrated in the accompanying drawings, in which- Figure 1 is a side view in elevation of a bicycle embodying my invention. Fig. 2 is a View in elevation of a section of the same looking from the line :0 m in Fig. 1.

In the drawings thus illustrating my invention, A represents a bicycle-frame, and B and B the wheels of a bicycle. The lower part of the seat-post A of the frame A is preferably made of a fork a a, which is joined to a crank-shaft hanger D. In this hanger I mount a crank-shaft D in the usual manner, provided with the usual cranks c 0, having pedals O O thereon. On the shaft D, l secure a wheel E, provided with an external gear-rim e, and a sprocket-wheel e thereon. In the fork a a I mount a shaft F, provided with a pinion f, intermeshing with the teeth of the gear-rim e on the wheel E and with a balance-wheel F and a bevel gear-wheel f thereon. In the fork a a, above the shaft F, I also mount a shaft G. On this shaft G, I mount a wheel H, provided with an external gear-rim h, of equal size with the gear-rim e, and a sprocketwheel h, of equal size with the sprocketwheel e. The gear-rim h intermeshes with the pinion f, and a sprocket-chain connects the sprocketwheels e and h, so that the wheels E and H rotate in unison and the gearwheels 6 and 7t thereon intermeshing with opposite sides of the pinion f operate to equalize the power exerted by the gears thereon.

On the rear side of the arm a of the fork a a there is a bearing J. On the frame A, ad-

jacent to the huh I) of the wheel 13, there is anotherbearing J. In these bearings I mount a shaft M, provided at one end with a bevelpinion 'm, which intermeshes with and is driven by the bevel-pinion f, and on the opposite end of the shaft M there is a bevel-pinion m, which intermeshes with a bevel-pinion K on the huh I) of the rear wheel B, so that the power of the gear-rims c and h is transmitted through the shaft F, bevel-gears f and on, shaft M, and bevel-gears m and K to the hub 19 of the rear wheel B, so as to drive the bicycle. By means of this construction I so apply the power of the cranks c c to the pinion f that the strain thereon is balanced in all directions, and the balancewheel F operates to maintain the momentum thereof, so as to equalize the speed.

Having thus described my invention so as to enable others to construct and operate the same, what I claim as new, and desire to secure by Letters Patent of the United States, 1s-

1. In a velooipede, the combination, with two driving-shafts arranged parallel with each other, of connecting mechanism constraining the said shafts to revolve simultaneously, means for revolving the said shafts, similar toothed driving-wheels secured on the said shafts, an intermediate shaft arranged between the two said driving-shafts, a toothed pinion secured on the intermediate drivingshaft and gearing into the said wheels, and means for connecting the said intermediate shaft with one of the road-wheels, substantially as set forth.

2. In a velocipede, the combination, with a frame provided with a forked portion, and two parallel driving-shafts journaled therein, one of the said driving-shafts being provided with cranks and treadles; of sprocket-wheels and toothed wheels secured on the said shafts outside the said forked portion, a drive-chain connecting the said sprooket-wheels,an intermediate shaft journaled in the frame between the two said shafts, a toothed pinion secured on the said intermediate shaft and gearing into the said toothed wheels, a balance-wheel secured on the intermediate shaft in the said forked portion, and means for connecting the said intermediate shaft with one of the road-wheels, substantially as set forth.

3. The combination in a bicycle driving- I gear on the rear-wheel hub, and a shaft and a bevel-gear on said pinion-shaft, a bevelbcvel-gears thereon connecting the bevel-gear on the pinion-shaft and the bevel-gear on the Wheel-hub, substantially as and for the purl5 pose set forth.

In testimony whereof I aifix my signature in presence of two witnesses.

EUGENE M. DAVIS. Witnesses:

HAROLD M. STURGEON, F. J. BASSETT. 

